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Wyszukujesz frazę "structural and physical−mechanical properties" wg kryterium: Temat


Wyświetlanie 1-3 z 3
Tytuł:
Jakość techniczna drewna 35-letnich świerków (Picea abies L. H. Karst) rosnących na powierzchni proweniencyjnej w LZD Rogów
Technical quality of wood of 35 years old Norway spruce (Picea abies L. H. Karst) growing on experimental plot in the Rogow Forest Experimental Station
Autorzy:
Bieniasz, A.
Lachowicz, H.
Buraczyk, W.
Moskalik, T.
Powiązania:
https://bibliotekanauki.pl/articles/986710.pdf
Data publikacji:
2017
Wydawca:
Polskie Towarzystwo Leśne
Tematy:
lesnictwo
drzewnictwo
swierk pospolity
Picea abies
proweniencje
drewno swierkowe
jakosc techniczna
wlasciwosci mechaniczne
wlasciwosci fizyczne
struktura drewna
wood properties
structural
mechanical and physical parameters
conifer timber
Opis:
The aim of this paper is to investigate and compare structural, mechanical and physical properties of wood of Norway spruce growing on experimental plot in Rogów (central Poland). The planting material consisted of seeds sourced from six selected provenances. Three of them originated from lowlands, while the others have mountain origins (tab. 1). The plot was established in 1975 and the wood was harvested in 2010. Wood samples were prepared and measured according to the Polish Standards describing those procedures. The following properties were subjected to the research and statistical analyses: average tree−ring width, share of latewood, wood density, compression strength parallel to grain, static bending, modulus of elasticity in static bending and the coeffi− cients of compression strength parallel to grain, static bending, and modulus of elasticity in static bending. Results of the investigation were correlated in the frame of each provenance. Wood density determines values of compression strength parallel to grain, static bending and modulus of elasticity in static bending. The higher wood density, the higher values of the mechanical properties. Ordering provenances by the wood density demonstrates the same results as ordering by values of compression strength parallel to grain. The high values of density and mechanical properties prove good technical quality of the analysed wood. The structural properties (the average tree−ring width and the share of latewood) are correlated to the wood density as well. They are additional features to describe wood quality, but are not as accurate as the mechanical properties. The quality of wood from all investigated provenances is high, what makes impossible to distinguish wood from selected provenances using applied features. Wood from Nowe Ramuki and Kartuzy (i.e. lowland) provenances has the best quality parameters, while one from Istebna Bukowiec and Stronie Śląskie (mountain) provenances demonstrated the worst properties (tab. 2). The results do not prove the opinion about the best quality of Norway spruce wood originating from the mountains.
Źródło:
Sylwan; 2017, 161, 10; 851-860
0039-7660
Pojawia się w:
Sylwan
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Jakość techniczna drewna 35-letnich świerków (Picea abies L. H. Karst) rosnących na powierzchni proweniencyjnej w LZD Rogów
Technical quality of wood of 35 years old Norway spruce (Picea abies L. H. Karst) growing on experimental plot in the Rogow Forest Experimental Station
Autorzy:
Bieniasz, A.
Lachowicz, H.
Buraczyk, W.
Moskalik, T.
Powiązania:
https://bibliotekanauki.pl/articles/986716.pdf
Data publikacji:
2017
Wydawca:
Polskie Towarzystwo Leśne
Tematy:
lesnictwo
drzewnictwo
swierk pospolity
Picea abies
proweniencje
drewno swierkowe
jakosc techniczna
wlasciwosci mechaniczne
wlasciwosci fizyczne
struktura drewna
wood properties
structural
mechanical and physical parameters
conifer timber
Opis:
The aim of this paper is to investigate and compare structural, mechanical and physical properties of wood of Norway spruce growing on experimental plot in Rogów (central Poland). The planting material consisted of seeds sourced from six selected provenances. Three of them originated from lowlands, while the others have mountain origins (tab. 1). The plot was established in 1975 and the wood was harvested in 2010. Wood samples were prepared and measured according to the Polish Standards describing those procedures. The following properties were subjected to the research and statistical analyses: average tree−ring width, share of latewood, wood density, compression strength parallel to grain, static bending, modulus of elasticity in static bending and the coeffi− cients of compression strength parallel to grain, static bending, and modulus of elasticity in static bending. Results of the investigation were correlated in the frame of each provenance. Wood density determines values of compression strength parallel to grain, static bending and modulus of elasticity in static bending. The higher wood density, the higher values of the mechanical properties. Ordering provenances by the wood density demonstrates the same results as ordering by values of compression strength parallel to grain. The high values of density and mechanical properties prove good technical quality of the analysed wood. The structural properties (the average tree−ring width and the share of latewood) are correlated to the wood density as well. They are additional features to describe wood quality, but are not as accurate as the mechanical properties. The quality of wood from all investigated provenances is high, what makes impossible to distinguish wood from selected provenances using applied features. Wood from Nowe Ramuki and Kartuzy (i.e. lowland) provenances has the best quality parameters, while one from Istebna Bukowiec and Stronie Śląskie (mountain) provenances demonstrated the worst properties (tab. 2). The results do not prove the opinion about the best quality of Norway spruce wood originating from the mountains.
Źródło:
Sylwan; 2017, 161, 10; 851-860
0039-7660
Pojawia się w:
Sylwan
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Wpływ siedliska na wybrane właściwości strukturalne i fizyko-mechaniczne drewna brzozy brodawkowatej (Betula pendula Roth.)
Effect of habitat on the selected structural and physico-mechanical properties of silver birch (Betula pendula Roth.) wood
Autorzy:
Lachowicz, H.
Jednoralski, G.
Paschalis-Jakubowicz, P.
Powiązania:
https://bibliotekanauki.pl/articles/990000.pdf
Data publikacji:
2014
Wydawca:
Polskie Towarzystwo Leśne
Tematy:
lesnictwo
drzewa lesne
brzoza brodawkowata
Betula pendula
siedliska lesne
las swiezy
las mieszany swiezy
drewno brzozowe
wlasciwosci strukturalne
wlasciwosci fizykomechaniczne
czynniki siedliska
silver birch
structural and physical−mechanical properties
commercial quality
habitat type
Opis:
The aim of the research was to determine the habitat−related variation in the selected structural and physical−mechanical properties of silver birch. Two sample plots were established in the territory of the Biała Podlaska Forest District in eastern Poland. Samples for measurement were taken from the plots with trees aged 45−50 years growing in the fresh deciduous (Lśw) and fresh mixed deciduous (LMśw) forest habitats. The following properties were subjected to statistical analysis: the average width of annual rings, wood density determined for the samples of 20×20×300 mm, 20×20×30 mm, and 30×2.66×0.1 mm in size (the last dimension parallel to grain), tensile strength parallel to grain, compression strength parallel to grain, static bending, modulus of elasticity in static bending and the coefficients of tensile strength parallel to grain, compression parallel to grain, static bending, and modulus of elasticity in static bending. The research confirmed a significant effect of the habitat on the mean values of birch wood density for all examined sample sizes, tensile strength parallel to grain, static bending and modulus of elasticity in static bending. No significant effect of the habitat on the mean values of annual ring width, tensile strength parallel to grain and the coefficients of tensile strength parallel to grain, compression strength parallel to grain, static bending and modulus of elasticity in static bending for birch wood samples was found.
Źródło:
Sylwan; 2014, 158, 04; 285-291
0039-7660
Pojawia się w:
Sylwan
Dostawca treści:
Biblioteka Nauki
Artykuł
    Wyświetlanie 1-3 z 3

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